I was thinking the same thing as above as a good start except with 20l jerry cans (water containers) somewhat easier to carry.
Improvisation is the key--1 example is that where i live right next to woodland i have lashed a pull up bar between 2 small trees--and that is just a sapling and some cheap rope, another one forms a dip bar.
Weight is all around us in some form or another, i had a look in the garage when i had the same problem and here are the things i found
Lead acid battery--real heavy.
All sorts of lifting ideas generated right there but following some basic rules :
Lift weight off the ground
Get it overhead
Carry it around
Rinse and repeat !!
That was just a start.
Then just on a walk around the woods i noticed all this ..yes..wood lying around and hey ho new exercise 'rucking' up and down the valley heaving loads of firewood around.
Start noticing structures--places to pull up on, for me that is branches and the rafters in my garage.
Then there are the basic exercises done anywhere with no kit whatsoever and all about just moving yourself around.
Press ups--all variants
Squats and pistols especially single limb.
Create your own games : 2 of mine
Every time i walk under my pull up bar i have to do a set of chins
Every time i get up off the sofa i have to do 10 press ups.
Use the month to go mad for conditioning, find hills and run up them, find sets of stairs and run up them, run around with weights.
Get creative...have fun...get outside...